来自形和形游泳者的冲运动的旋动力学
Zahra Maleksabet1, Maham Kamran2, Ali Tarokh2
1Department of Mechanical and Mechatronics Engineering, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario, P7B 5E1, Canada.
Bioinspiration & biomimetics
|March 9, 2026
概括
鱼类的游泳动作,比如冲,会产生不同的醒来. 增加工作周期 (DC) 创造了更连贯的清醒,而更高的Strouhal数 (St) 增加了间歇性游泳的阻力.
科学领域:
- 流体动力学 流体动力学
- 生物力学 生物力学
- 机器人技术 机器人技术 机器人技术
背景情况:
- 鱼类利用身体和尾巴的波动进行推进,有诸如形和形行走的变化.
- 间歇性游泳 (爆发和海岸) 提供节能,但改变了唤醒动力学和水力动力学力量.
研究的目的:
- 调查如何工作周期 (DC),波动步态和斯特劳哈尔数 (St) 影响近体,唤醒结构和水力动力学力.
- 分析间歇性和连续性游泳对特征和阻力的影响.
- 为设计生物灵感的水下机器人提供见解.
主要方法:
- 三维计算流体动力学 (CFD) 模拟在 3000 的雷诺兹数 (Re).
- 对于绑定的鱼和鱼模型进行的模拟.
- 参数变化包括工作周期 (DC = 0.21.0) 和斯特鲁哈尔数 (St = 0.30, 0.40).
主要成果:
- 冲浪式游泳会产生弓形的醒觉;将直流增加到1.0会导致更连贯的醒觉,类似于连续的波浪.
- 在较高的斯特劳哈数下间歇性游泳会产生较高的阻力,与连续的波动动力学形成鲜明对比.
- 动力学和动力学指标被量化,以解释阻力变化和不稳定的力.
结论:
- 这项研究阐明了鱼类游泳动力学,动力学和水力动力学力之间的关系.
- 这些发现为优化自主生物灵感水下车辆设计提供了关键数据.
- 了解这些原则有助于实现机器人系统的特定水力动力性能指标.
相关概念视频
Laminar and Turbulent Flow
11.3K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
11.3K
Rapidly Varying Flow
582
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
582
Irrotational Flow
1.1K
Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:
1.1K
Buoyancy and Stability for Submerged and Floating Bodies
3.5K
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
3.5K
Fixed Action Patterns
17.9K
A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
17.9K
Free Jet
636
Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
636


